Mid Wales and Cambrian Mountains
Tuesday 1 September 2026 · Cadair Idris, Pumlumon and the central Welsh hills
Why: Thunderstorm timing is inherently uncertain and may shift by several hours.
Thunderstorms are the main concern, especially on exposed summits and ridges. A noticeable westerly breeze and Persistent rain.
High-ground wind (700 m)
Westerly 15-20 mph at 700 m. Gusts reaching around 25 mph at 700 m, with locally higher values possible on the most exposed tops. Strongest early (around 15 mph), easing toward 10 mph later.
Walking impact
Noticeable on exposed ground, but unlikely to impede most walking.
Thunderstorms
A moderate thunderstorm risk is indicated from early morning into the evening. Avoid committing to exposed summits or ridges while storms are building or nearby.
Ground conditions
The ground is likely to be wet after recent rain.
Spate risk
High spate risk based on forecast rainfall. Burns and unbridged crossings may become difficult or impassable. The heaviest rain is expected around the middle of the day. Crossing risk is expected throughout the day, continuing overnight and easing after around midnight. Turn back if a crossing looks unsafe.
Rain and showers
Persistent rain for much of the day. The heaviest rain is expected around the middle of the day.
Cloud-free summits
Around 25%. Around 20% early, improving to around 35% later.
Cloud and visibility
Cloud bases mostly around 500-800 m. Summit breaks should become more frequent later. Most higher summits are likely to be in cloud for much of the day, with only brief or isolated breaks.
Temperature and wind chill
Around 10°C at 700 m, feeling like 6°C in the wind.
Freezing level
Above the summits.
Daylight
Sunrise 06:24 — Sunset 20:03 — about 13.7 hours daylight.
Overnight · 6 p.m.–9 a.m.Wild campingBetaThunder risk is around 34% in parts of the area; avoid exposed pitches if storms develop. 55/100Mixed · 600 m View detailsHide details
Full regional overnight outlook
Across representative hills, open-hillside camping looks mixed around 600 m (55/100). Little rain is expected, but cloud or condensation could still mean a wet pack-up.
Elevation reference (open ground)
- Wind / gust
- 3 / 14 mph
- Coldest
- 9.0°C
- In cloud
- Unlikely
- Condensation
- Low
- Wind / gust
- 4 / 17 mph
- Coldest
- 8.9°C
- In cloud
- Unlikely
- Condensation
- Low
- Wind / gust
- 10 / 24 mph
- Coldest
- 2.2°C
- In cloud
- 50% of night
- Condensation
- Moderate
Open-hillside guidance across representative hills. Local shelter, ridges, tent design and the exact pitch can change conditions substantially. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.
Daytime · exposed rockClimbing & scramblingBetaThunder risk is around 34% in parts of the area; exposed scrambling may be a poor choice. 0/100Poor · Very poor View detailsHide details
Full regional climbing & scrambling outlook
Conditions for exposed scrambling across the area look very poor (0/100). Rain is likely to leave rock wet; polished slabs, vegetation and drainage lines may be notably worse. Gusts may reach about 25 mph on exposed ground, making crosswinds an important route consideration. Mapped summit-point geology across the representative hills includes volcanic rock, granite, gneiss or gabbro and sandstone or gritstone; moisture response can therefore vary substantially between crags and routes.
Representative summit-point samples across the region; individual crags and routes may differ.
Generic exposed hands-on-rock terrain across representative summits; mapped summit-point geology is a broad regional sample, not a named-route survey. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.
Updated 30 August 2026 at 04:40 UTC. See typical weekly and monthly conditions for Mid Wales and Cambrian Mountains.